San Carlos
- A.D. San Carlos
- Charles Borromeo
- Charles of Sezze
- Colegio Nacional de Buenos Aires
- Easter Island
- Federal University of São Carlos
- Fort San Carlos
- La Unión, El Salvador
- Luba, Equatorial Guinea
- Port San Carlos
- Quesada, San Carlos
- Rumsen
- Rumsen language
- San Carlos (Equatorial Guinea)
- San Carlos (canton)
- San Carlos Airport (disambiguation)
- San Carlos Alzatate
- San Carlos Apache Indian Reservation
- San Carlos Bay
- San Carlos Convent
- San Carlos Department, Mendoza
- San Carlos Department, Salta
- San Carlos District, Bongará
- San Carlos Fortress
- San Carlos Lake
- San Carlos Minas
- San Carlos Municipality, Tamaulipas
- San Carlos Nuevo Guaymas
- San Carlos Park, Florida
- San Carlos River (Falkland Islands)
- San Carlos River (disambiguation)
- San Carlos Sija
- San Carlos Stakes
- San Carlos Water
- San Carlos Yautepec
- San Carlos de Bariloche
- San Carlos de Bolívar
- San Carlos de Borromeo Fortress
- San Carlos de Guaroa
- San Carlos de Río Negro
- San Carlos, Antioquia
- San Carlos, Arizona
- San Carlos, Baja California Sur
- San Carlos, Belize
- San Carlos, California
- San Carlos, Chile
- San Carlos, Chiriquí
- San Carlos, Cojedes
- San Carlos, Distrito Nacional
- San Carlos, Falkland Islands
- San Carlos, Ichilo
- San Carlos, Inyo County, California
- San Carlos, La Plata
- San Carlos, Mendoza
- San Carlos, Morazán
- San Carlos, Negros Occidental
- San Carlos, Panamá Oeste
- San Carlos, Pangasinan
- San Carlos, Paraguay
- San Carlos, Río San Juan
- San Carlos, Salta
- San Carlos, San Diego
- San Carlos, Texas
- San Carlos, Uruguay
- San Carlos, Valencia, Bukidnon
- São Carlos
- Teatro Nacional de São Carlos
- Teatro di San Carlo
- Universidad de San Carlos de Guatemala
- University of San Carlos